Is AD 2003-20-12 a recurring Airworthiness Directive?

No — AD 2003-20-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2003-20-12 apply to?

AD 2003-20-12 applies to Eurocopter — models AS350B3, SA365N, SA365N1, AS365N2, AS365N3, EC155B, AS350, SA365. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2003-20-12

one-time

Official AD 2003-20-12 · FR doc 03-25593 · 2003-10-14 · airframe

Airworthiness Directives; Eurocopter France Model AS 350B3, SA-365N, N1, AS-365N2, AS 365N3, and EC 155B Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) for the specified Eurocopter France (Eurocopter) model helicopters that requires modifying the SIREN cargo hook and inspecting the cargo hook locking catch (locking catch) for corrosion. This amendment is prompted by the discovery of internal corrosion on a Siren locking catch that may weaken the locking catch. The actions specified by this AD are intended to detect internal corrosion of the locking catch, which can cause the locking catch to return to an incomplete locking position, undetectable by the operator, and result in an unexpected cargo load release.

Which aircraft AD 2003-20-12 applies to

MakesEurocopter

ModelsAS350B3, SA365N, SA365N1, AS365N2, AS365N3, EC155B, AS350, SA365, AS365, EC155

Part-conditional — AS-21-5-7.

Applies to Siren cargo hook, P/N AS-21-5-7, installed on Model AS350B3, SA365N/N1/AS365N2/AS365N3, and EC155B helicopters. If Amendment B is incorporated (identified by markings on the cargo hook), a daily pre-use check of locking-catch reference-line alignment for corrosion is required. If Amendment B is not incorporated, it must be incorporated before the next sling load flight per Eurocopter Alert Telex Nos. 05.00.39 (AS350B3), 05.00.41 (SA365N/N1/AS365N2/AS365N3), and 05A002 (EC155B).

Whether AD 2003-20-12 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 2003-20-12 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.